Sometimes, working, I forget to eat. My friends don’t believe that you can forget to eat. They think if you don’t eat you get jittery and weak and blank in your brain – how can one work through that?

Then I remember that I used to be like that, too. To this day my family makes fun about the time I wanted to fast for a day, and broke the fast after three hours because I couldn’t go on – it felt as if I was falling apart.

The difference between being hungry and being in the grip of hypoglycemia lies in how healthy your metabolism is. When you are diabetic or prediabetic (and most Americans fall in either category), you are always looking for food. You cannot go without for any prolonged time. Most Americans, for that reason, do not only eat, but they snack in between. And, listen – I don’t blame them. Because if your metabolism is lousy (because of the Standard American Diet – or SAD) you NEED to eat frequent meals. Otherwise you fall apart. You feel you are hungry. In reality you are voracious because your cells are on a sugar rollercoaster.

This is how your metabolism – the sum of all the chemical and biochemical events in your body at any given time – functions if you eat SAD: You eat a load of sugar (white starches are chains of sugar molecules that are being digested within seconds of entering your mouth, filling you up with sugars, and more sugars). Your brain gets a nice sugar high. Insulin kicks in because high sugars are dangerous for your body (leading to blindness, impotence, heart disease, stroke, dementia, amputations, polyneuropathy, and so on). Since high sugars are so dangerous, your body shoots out much to much insulin. Next thing you know, your blood sugar is really low, and you feel lousy: weak, confused, shaky. What do you do? Well, you reach for another meal or a snack that starts the high-sugar/low-sugar cycle again. On the way, you gain weight because weight gain is the number one side-effect of insulin. And you go see-sawing through high and low blood sugars, never feeling top-fit and at your best potential.

What is the difference when your metabolism is healthy? You eat your three meals, and then you forget about it. You have energy to pursue what you love to do in life. And yes, sometimes you forget to eat because making music, or cleaning the yard, or making a scrapbook is so much fun.

What to eat to reach your perfect metabolism I have described in my diabetes book. But the main points are: Stop sugars and white starches (and don’t replace them with artificial sweeteners). Eat proteins and good fats in every single meal. Within a day or two, your body will experience the difference between hunger and hypoglycemia. When somebody around you says: “I am hungry,” I bet that in ninety percent they are talking the low-sugar jitters. Real hunger is different. Our ancient bodies are made to survive the normal periods of hunger and plenty of food. Our ancient bodies are not made to survive the overfeeding with sugars.

By the way, I didn’t say that you can just suppress that feeling of being “hungry” and ignore it. That is exactly the point: Hypoglycemia is a real condition, and really dangerous. Don’t try to starve when you come off a sugar high. Eat reasonably first. Then you can even put in a fasting day – as I can do now without difficulty. Or you can, once in a while, forget to eat altogether because you are so happily ensconced in a project that warms your heart.

My experiment is going on. Of course, I have no idea if it is really new brown fat that turns me into an oven every time after my daily cold laps in the pool. For all I know, I could have a not-yet-recognized infection or any other disease that makes me burn up. Only thing I know is that I feel terrific – for the moment.

But for the sake of an interesting exploration, let’s stick with my brown fat hypothesis. This is what I have learned about about brown fat so far:

1. It used to be thought that only babies (protecting them from hypothermia) or bears (keeping a reasonable core temperature during hibernation) have brown fat. It turns out that traces of brown fat are still around in adult people. – A little aside: Other ways to increase body temperature are increasing surrounding temperature, moving about, shivering, and eating certain “warming” foods like cinnamon, ginger, onions, garlic, rutabaga, coriander, cloves – interestingly foods often used in the winter kitchen. But there is no hint that those foods increase brown fat. Or a shred of a proof that a so-called "Brown Fat Diet" will increase that precious tissue in your body.
2. Brown fat can help weight loss by increasing metabolism speed.
3. Brown fat also can decrease elevated insulin-resistance (also called pre-diabetes) and a diabetic situation.
4. Brown fat can be induced to increase by cold exposure – be it by swimming in cold water, immersing in a tub filled with ice water, or dancing in a walk-in food refrigerator (don’t you wish you had one of those at home??).
5. Needless to say, there are already pharmaceutical firms are already working on drugs that might trigger growth of brown fat, without going through the ado of cold exposure. The easy way out, I call it. And definitely not an interesting way, if you ask me.

I like to think about cold-induced brown fat as one of the benefits of moderate stress. We all know that stress is bad for you, don’t we? Not necessarily though. Moderate stress might be what makes the body function in the way Nature intended it. With heated dwellings with forgo the winter cold stress – and get sick for it, lacking brown fat. With air-conditioning in the summer, we miss out on the sweating which give our body a good cleanse of all the toxins – and get sick for it. Occasional hunger stress (fasting!) is another beneficial stress mechanism. Not only do we get healthier on occasional fasting, and live longer with less belly ballast, it also seems we get to be happier with fewer pounds – and less depressed.

One estimate is that there are about three million residential swimming pools in California (I am not even mentioning the pools in Florida and all across southern U.S.A.). If these pools are anything like our pool here in La Jolla, all those turquoise eyes should be gazing at the sky, basically unused. All, of course, using up precious water resources. How about using them? If you are in decent health (ask your physician), you start by doing a single lap across your pool. Tomorrow two, and every day one more until you reach twenty-one laps. The brown fat will appear very fast – and will help you lose weight.

Putting on brown fat, however, might mean walking a fine line: You want to increase your metabolism by cold exposure. But you don’t want to get where most winter swimmers end up: with more fat on their bodies. Fat (of any kind) protects against cold, and makes you better able to withstand long swims in icy water. Don’t go there!

The experiment is still on: How long into the winter will I succeed to keep up my daily twenty-one laps in the pool?

So far, so good. The water is much colder now, but the days have been sunny and friendly – the fog lifted while we were at the East Coast.

Truthfully, lately it has been harder to face the pool: I am still battling a minor cold, and every day I have to decide if it is prudent to swim with the cold, or if I should just snuggle up in a warm blanket. But the exhilarating feeling after my daily swim – I seem to be addicted to it. I look full of vigor. My posture definitely is straighter. I am building up muscles where I never had any – on my back and my arms. Plus, the tiny belly I had is getting smoother (not smaller).

On the negative side is my skin. No outright rash or itching yet, but I have the suspicion that my skin looks a bit older, notwithstanding the coconut oil I slab all over me after each bath.

For a few days, I had been getting extremely cold after each swim, and couldn’t get warm at all. If you ever read my water book, you know that staying cold after water exposure is not a good idea. But with my inborn stubbornness (which might just get worse with age …) and medical curiosity, I kept doing what I should not have done: go swimming. And got colder and colder. In spite of the knee bends, blankets and hot tea with fresh ginger. Two nights in a row, I didn’t get warm all night – certainly not a healthy state!

Until yesterday. Shortly after I went swimming, had taken my short cold shower to get rid of the chlorine, had done my exercise, had rolled up in my blanket and imbibed the tea, I got really warm. Even my hands felt tingling with warmth. This lasted all night, and is still going on. I suddenly had the feeling that, for the first time in my life, that I was getting on the warm side in life. Like, where my husband always is.

Looking around for an explanation, I stumbled onto brown fat. Brown fat gets activated by cold. Brown fat is supposed to be healthier than yellow fat that just stores superfluous calories. Babies have more brown fat because it protects them from hypothermia – a constant threat for newborns.

Brown fat is not so much fat but is related to muscles. Brown fat is brown from the mitochondria and their iron contents; mitochondria are tiny energy factories. Brown fat has also more blood vessels for better oxygenation and is metabolically more active than yellow fat – it actually burns calories instead just storing them.

So, by swimming in the cool pool, I must have tapped into my brown fat – I can’t come up with any other explanation. And did you know? Brown fat is implemented in weight loss. Yes! Brown fat can make you lose weight – IF you have enough brown fat.

Sebastian Kneipp, the father of the Kaltwasserkur (Cold Water Cure) is famous for jumping into the wintry Danube River to cure his tuberculosis. Later, he modified his approach because he observed that some weakened patients were not able to withstand the bitter cold he himself had applied to his body. One could say he watered down his original approach … I had always repeated what I had been taught: that too much cold might be hazardous to your health. Which still might be true for frail people.

But I might be onto something here … I will let you know how this will work out.

Science is telling us that the adage "You are what you eat" is truer than we ever thought:

Recently a study showed that what mothers eat during pregnancy shows up in the amniotic fluid around the growing baby, giving the baby a taste of what the mother eats - and forms later preferences for food that it already "knows."

We know already that mothers who are obese will have overweight children; that might be genetics, or as we are finding out more and more, epigenetics. One study from the Netherlands showed that women who were going hungry during the poor years during and after World War II had overweight children later down the line. - Apparently under- and overfeeding the mother is changing something metabolically in the unborn baby.

And now the newest insight comes from studies on male sperm: How the man is fed during building of his sperms also influences the weight and health of his future off-spring.

It seems that, when we are eating, we are responsible not only for our own health, but also for the health of our unborn children. Amazing, isn't it?